DCPBH lasers with LPE grown cobalt-doped semi-insulating InP layer for lateral current confinement are described. The lasers with this cobalt-InP layer have higher external quantum efficiencies than the ones without. Low threshold current lasers (15–35 mA) are obtained for active region width of 2–3 µm.
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Shi et al. (1986) studied this question.
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